So how do you describe "the fullness of the gentiles has come in?"
Seems even history would record this amazing and once in a lifetime event!
In context, the fullness is not about quantity but quality, in that the Gentiles are being grafted in as Paul was writing the letter to the Romans.
For I do not desire, brethren, that you should be ignorant of this mystery, lest you should be wise in your own opinion, that blindness in part has happened to Israel until the fullness of the Gentiles has come in. And so all Israel will be saved.
All Israel >>> the righteous remnant
at that time.
So contextually, it is their acceptance into the ONE root, along with Israel.
And that “fullness” was not dependent on how many, or how few had accepted the Gospel, is was about equality.
It was their status within
the Root that was being debated and at stake, a status that was being resisted by Israel
at that time, but, a status that some of them were boasting about, as if they had replaced Israel
at that time.
They were claiming that they were now in the predominant position
at that time but, Paul was denying that and affirming their equality of standing.